The Research of Interwell Connectivity Evaluation and Controlling Countermeasure in Conglomerate Reservoir

In order to solve the problem that single sand body and connected relationship between wells is difficult to quantitative characterization in gravelly braided river sedimentary reservoir with serious heterogeneity, this paper innovation presented the connectivity evaluation with conductivity, which set up connected quantitative evaluation model based on single well conductivity, to implement different sand body, phase change, and other forms of connectivity quantitative evaluation and grading. This method is applied in 530 wellblock J1b51 gravelly braided river sedimentary reservoir, in which the evaluation model of conductivity is divided into three types, combined with the single well production performance and sand body static connecting relation, eventually the interwell connectivity is divided into 3 level: weak (I), medium (II), strong (III). According to the interwell connectivity level the oil and water wells is classified guidance control, in which class I mainly to oil well fill holes, fracturing measures, class II mainly to oil well fluid volume adjustment, class III mainly to water well profile control, which can improve the reservoir development effect and increased 8479 tons of oil, water cut rising rate from 3.0% to 1.5%, the effect is remarkable. The results of the study can widen the interwell connectivity quantitative evaluation thoughts. It is of great significance for the reservoir evaluation and injection-production adjustment of oilfield.